(MB): obfuscated BMP image.

ArcFormats/ArcFormats.csproj

@@ -109,6 +109,7 @@
     <Compile Include="ExHibit\WidgetGYU.xaml.cs">
       <DependentUpon>WidgetGYU.xaml</DependentUpon>
     </Compile>
+    <Compile Include="ImageMB.cs" />
     <Compile Include="Ipac\ArcIPAC.cs" />
     <Compile Include="Ipac\AudioWST.cs" />
     <Compile Include="Ipac\ImageIES.cs" />

ArcFormats/ImageMB.cs

@@ -0,0 +1,73 @@
+//! \file       ImageMB.cs
+//! \date       Sun Sep 18 19:05:50 2016
+//! \brief      Ancient obfuscated BMP image.
+//
+// Copyright (C) 2016 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats
+{
+    [Export(typeof(ImageFormat))]
+    public class MbImageFormat : BmpFormat
+    {
+        public override string         Tag { get { return "BMP/MB"; } }
+        public override string Description { get { return "Obfuscated bitmap"; } }
+        public override uint     Signature { get { return 0; } }
+
+        public override ImageMetaData ReadMetaData (Stream stream)
+        {
+            int c1 = stream.ReadByte();
+            int c2 = stream.ReadByte();
+            if ('M' != c1 || 'B' != c2)
+                return null;
+            using (var bmp = OpenAsBitmap (stream))
+                return base.ReadMetaData (bmp);
+        }
+
+        public override ImageData Read (Stream stream, ImageMetaData info)
+        {
+            using (var bmp = OpenAsBitmap (stream))
+                return base.Read (bmp, info);
+        }
+
+        Stream OpenAsBitmap (Stream input)
+        {
+            var header = new byte[2] { (byte)'B', (byte)'M' };
+            input = new StreamRegion (input, 2, true);
+            return new PrefixStream (header, input);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            using (var bmp = new MemoryStream())
+            {
+                base.Write (bmp, image);
+                file.WriteByte ((byte)'M');
+                file.WriteByte ((byte)'B');
+                bmp.Position = 2;
+                bmp.CopyTo (file);
+            }
+        }
+    }
+}